It could possibly be Bottom Scanner, which is part of the Auctioneer Pack (new mod as of 2.0). I've been having memory issues as well, running up to my limit of 130- which then freezes the game for about 5-10 secs until it comes back down.
Yesterday, I switched from Titan to FuBar, since (while probably not much) it will use less memory. I also turned off Bottom Scanner, since I don't really use it anyway. I'm running a ton of mods, so I need to go through and either evaluate if I really want them
or tone down some of their functions. But I haven't played much to test whether turning off Bottom Scanner made a difference yet.